Boiler tube blower



Nov. 22, 1932.

O. K. BOGSTRAND BoILER TUBE BLOWER Filed Nov. 12

5140044 501 O/e (Bogs/rand Mot/nu;

Patented Nov. 22, 1932 OLE K. BOQSTBAND, OF BROOKLYN, YORK BOILER TUBE BLOWER L Application filed November 12, 1926. Serial No. 147,863.

The present invention relates to improvements in boiler tube blowers designed to deliver a series of steam jets in the form of a sheet of steam to boiler tubes for the purpose of cleaning the same and removing therefrom soot and other deposits.

This application is a continuation in part of my prior application, Serial No. 633,871, filed April 23, 1923.

The present invention aims to provide a boiler tube blower equipped with a nozzle for delivering a sheet of steam at a high velocity and at substantially the pressure of the boiler or" source of supply. The sheet of steam so delivered is also characterized in that the individual jets thereof all have substantially the same velocity. The invention further provides a boiler tube blower in which the character of the sheet of steam deliveredthereby may be varied. The invention also contemplates the provision of a device of this class which is adapted not only to clean the boiler tubes but also to clean the back end wall, top and sid'esof the combustion chamber without interfering with the fire or permitting the steam to blow out the same or allowing the fire to be blown back into the stokepit, thus to injure the fireman.

9 The invention is further characterized by 'a simple and eflicient valve for controlling the flow of steam to the nozzle and in the cheapness and effectiveness of the construction as a whole.

Reference will now be had to the accompanying drawing forming a part of this specification and in which Figure 1 is a vertical section of afragment of a tubular boiler head showing in connection therewith and in longitudinal section a steam blower constructed and arranged in accordance with the present invention;

Figure 2 is a view looking upward at the device shown in Figure 1;

Figure 3 is a plan view of the nozzle employed 15. By bore 14, the steam is permitte Figure 4 is a cross section taken on the line 44 of Figure 1; v

Figure 5 is a similar view taken on the line 55 of Figure 1;

Figure 6 is also a sectional view and is taken on the line 6-6 of Figure 1;

Flgure 7 is a plan sectional view through the nozzle.

Figure 8 is a view of one of the vanes of the nozzle.

Referring now more particularly to the drawing, in which similar reference numerals denote similar parts throughout the several views, the device shown embodies a tube 9 wh1ch is fixedly mounted in the head of the 50 boller to form a channel onrunway in which s adapted to be positioned the blower herematter more particularly described. Longitudinally mounted on the end of the tube 9 1s a valve body 10 of the blower which has a downwardly extending nipple 11 normally connected with the steam supply and provided with an orifice through which steam is admitted into the interior of the valve body.

. Within the tube 9 and the valve body 10,

there is an interior tube 12, having an enlarged bore 13, at its front end. The nozzle 15 is attached to the end of the interior tube 12, as by screw-threads. It projects into the interior of the boiler head and is adapted to emit steam into the tubes of the boiler. The steam entering through the orifice in the nipple 11 passes through a circumferential groove16, between the tube 12 and the valve body 10, thence through apertures 17 in the side of the tube 12 into the bore 14:. From the bore 14, the steam passes between inward- 1y projecting members 18 between which are situated the apertures 17 and which serve both to strengthen the tube 12, and to ide the steam so as to prevent excessive ed ying thereof. The steam then passes into the enlarged bore '13, and out through the nozzle making the bore 13, larger than the to expand 55 reference more particularly to Figure 1, it

slightly in its passage and thus a construction is provided in which no back pressure is built up and in which the recoil of the steam in 1ts passage thru the nozzle is counterbalanced by the steam within the bore.

On the back end of the tube 12 there is a gland packing 19 between the tube and the valve body which packing may be adjusted by means of bolts 20 to increase its sealing action. A plug 21 is threaded in the end of the tube 12 and a set-screw 22 extends through the tube-and into the plug, thus insuring a rigid association of the plug with the tube. A hand wheel 23 is attached to the plug 21, in any suitable manner. Other packings 24 and 24a are inserted between the tube 12 and the other end of the valve body which packings also serve as steam locks.

From the description so far, it will be noted that when the tube 12 and parts associated therewith are drawn backward or outward from the boiler, the aperture 17 inside of the tube no longer aligns with the orifice extending through the nipple 11 and the packing 24 blocks and seals this orifice, thus terminating the flow of steam therethrough. Hence the flow of steam may be controlled by moving the hand wheel backward Or forward, thus to move the tube 12 back and forth and to seal or unseal the'orifice in the nipple 11.

The nozzle 15 is substantially circular in cross section throughout a large portion of its length and terminates in a conically shaped end as seen from above, thus providing a construction by means of which a sheet of steam may be projected. The exterior of the nozzle has a flange 25 which serves to position the nozzle centrally in the tube 9 and also serves as a seal to prevent steam,

' if it find access to the tube 9, from entering the boiler. As best seen in Figure '1 the bottom of the nozzle has a portion 26, WhlCh projects; slightly inwardly into the bore of.

the nozzle. By means of this construction the steam after it passes through the bore 13 is deflected slightly upward, and is caused to assume a slightly circular path. Within the interior of the nozzle a number of vanes 27 are pivotally mounted by means of set screws 28. This construction permits the position of the vanes 'to be adjusted to change the character of the sheet of steam emitted. By

will be noted that the curvatures of the vanes vary, said curvatures increasing progressively from top to bottom and being of a curvature such as to provide orifices curving gradually in directions such that the directions of the fluid therethru are always substantially normal to the directions of the orifices.

The direction of the steam, therefore, in its passage betweenfithe vanes is very gradually changed being at all times tangentlal to the the smaller portion of,

' substantially curvature of the passage through which it passes There is thus no abrupt change in the dlrectlon of the steam and since the frictional resistance ofi'ered to the passage of the steam 1s approximately the same in all the channels formed between the vanes,the velocities of the jets comprising the sheet of steam projected are approximately the same. This blower therefore provides a construction in which a flat fan-shaped sheet of steam is projected spreading out over an angle slightly in excess of 15 and in which the velocity of the steam is uniform throughout. Moreover, because of the difference in size between the bores 13 and 14, as pointed out above, this sheet of steam is projected from the nozzle Y or source of supply.

The lower part of the nozzle has a rigid vane 29 of rather large thickness and between this vane and the lower wall of the nozzle there is formed an orifice 30. The steam is emitted through the orifice 30 in a direction perpendicular to the axisof thenozzle and serves to clean the back wall, top and sides of the combustion chamber. There is, however, no danger of the fire being blown out or back into the stokepit by the steam because the large vane 29, provides a break in the sheet of steam emitted, thus preventing it from striking the fire and eliminating all danger to the operator.

imity. to the tubes to be cleaned and the boiler fire box comprising a body portion having a longitudinal bore, a plurality of relatively thin vanes mounted within the bore adjacent the exit end thereof, and another relatively thick vane also mounted within the bore adjacent the exit end thereof and spaced from the wall of the nozzle to form an orifice for 1 emitting a jet of steam in a direction substantially perpendicular to the axis of the nozzle bore, said thick vane being so constructed and arranged as to provide a substantially fan-shaped area substantially void of steam between the streams of steam emitted from orifices formed by the thin vanes and the substantially perpendicular jet of steam when the blower is in operation so that steam will be prevented from being projected into the fire in the fire box of the boiler.

j 2. A blower of the class described comprising a tubular member having a bore, a nozzle on one end of the tubular member, means for admitting a fluid into the other end of the tubular member, said means including apertures in the wall of the tubular the bore substantially from wall to wall and 5 member, and a plurality of inwardly projecting members between the apertures for strengthening the tubular member and for guiding the fluid.

3. A blower of the class described comprising a tubular member having a bore, a nozzle on one end of the tubular member, means for admitting a fluid into the tubular member adjacent the other end thereof and means within the bore of the tubular member adjacent the first mentioned means for providing a plurality of radially arranged longitudinally extending paths of substantially equal width for the fluid in its passage through the tubular member to the nozzle.

4. A nozzle for projecting a fluid comprising a body portion having a longitudinal bore, a plurality of relatively thin vanes mounted within the bore at one end thereof, and means for admitting a fluid into the other end of the bore, said bore being slightly enlarged on slightly curved lines adjacent'the inner'ends of the vanes in such manner that any back pressure at this point is substantially eliminated and the fluid may pass from the nozzle in a constant stream of undiminished force.

5. A nozzle of the class described slidably supported in a casing and comprising a body portion having a longitudinal enlarged bore at one end, a smaller longitudinal bore at the other end forming a. chamber closed at the rear end, apertures in the body portion adjacent the juncture of the two bores, said casing having a conduit extending laterally of the body portion arranged and constructed to direct a fluid into said enlarged'bore through said apertures substantially axially of said bore.

6. A blower of the class described slidably Nov., 1926.

' OLE K. BOGSTRAND.

supported in a casing and comprising a tubular member having a longitudinal enlarged bore in one end, a smaller longitudinal bore at the other end forming a'ehamber closed at its rear end, a valve body surrounding the end of the tubular member having the smaller bore and having a laterally extending nipple leading into a circumferential groove formed between the'valve body and the tubular member adjacent the juncture of the two bores, said nipple being so arranged as to direct a fluid into said groove substantially axially of and toward the enlarged bore, apertures in said tubular member connecting said groove with said bores and so con.- structed and arranged as to direct fluid from said groove into'said enlarged, bore substantially axially thereof and a nozzle at the outer end of the enlarged bore.

7. A nozzle for projecting a fluid compris ing a body portion having a longitudinal bore and a plurality of rigid vanes mounted with-I in the bore adjacent the exit end thereof each of said vanes extending transversely oi use 

